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I am required to prevent certain users on my Qmail Server from sending
emails to outside domain.
In my understanding, only IP Addresses can be prevented from relaying!
But that's something which does not work in my environment considering
we have DHCP setup.
Any help will be appreciated.
Regards,

Hello,

not 100% sure, but I think you can do it via vmoduser and adding -r flag
to the user. This, however, will require smtp auth usage.